Abstract Detail

Molecular Ecology

Zhang, Yonghua [1], Cai, Minqi [2], Chen, Yao [2], Xie, Xinglv [2], Cameron, Kenneth [3], Fu, Chengxin [2], Li, Pan [2].

Both climatic change and geographic isolation have driven the diversification of Amana in East Asia.

Premise of the Study: East Asia is species-rich and has high levels of endemism, yet the evolutionary processes responsible for the origin and diversification of endemism in this area remains largely unexplored. Herein we used the genus Amana, endemic to East Asia, to gain new insights into the origin and diversification of endemism in this important biome.
Methods: We reconstructed the phylogeographical pattern, molecular phylogeny and temporal history of Amana based on five plastid (rbcL, rpoC, ndnF, rrn23S, psbB-H) and one nuclear (ITS) markers. We then combined climatic, geographic and morphologic parameters with the molecular phylogeny to test the roles of climatic change and geographic isolation in the origin and diversification of Amana.
Key results: The genus Amana is monophyletic and divided into two clades, corresponding to broadleaf group with two subclads (south vs. north) and narrowleaf group with four subclades (from south to north), respectively. The time to the origin of Amana was c. 22 Ma during the Early to Middle Miocene, coinciding with the initial intensification of the Asian monsoon. The time since divergence between two clades had occurred 11.86 Ma (95% HPD: 18.13–7.30 Ma), and six subclades arose during Late Miocene to Pleistocene (9.33–3.30 Ma), corresponding temporally to the subsequent intensification event of the Asian monsoon. Analyses of ecological disparity (DTT) indicated a departure from a neutral (Brownian) model of evolution, and SEEVA (spatial evolutionary and ecological vicariance) analyses showed that different subclades tend to evolve under different potential climatic niches, especially in terms of BIO4 (Temperature Seasonality), BIO12 (Annual Precipitation), BIO14 (Precipitation of Driest Month), BIO17 (Precipitation of Driest Quarter) and BIO19 (Precipitation of Coldest Quarter). The leaves gradually narrowed as the latitude increased in each of two clades. Geographical ranges showed little overlap between related subclades.
Conclusions: Our results suggest that two independent intensifications of the East Asian monsoon around the Early to Middle Miocene and the late Miocene to Pleistocene and subsequent geographic isolation may have jointly facilitated the origin and diversification of Amana in East Asia.

1 - Sun Yat-sen University, School of Life Sciences, 135 Xingang Xi Rd., Guangzhou, Guangdong, 510275, China
2 - Zhejiang University, College Of Life Sciences, 866 Yuhangtang Rd., Hangzhou, Zhejiang, 310058, China
3 - University of Wisconsin, Department of Botany, 154 Birge Hall, 450 Lincoln Drive, Madison, WI, 53706, USA

Keywords:
none specified

Presentation Type: Poster
Session: P, Molecular Ecology
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PME001
Abstract ID:349
Candidate for Awards:None